package com.rljk.utils;

import java.text.SimpleDateFormat;
import java.util.Date;

public class RelativeDateFormat {
	
	private static final long ONE_MINUTE = 60000L;  
    private static final long ONE_HOUR = 3600000L;  
    private static final long ONE_DAY = 86400000L;  
    private static final long ONE_WEEK = 604800000L;  
  
    private static final String ONE_SECOND_AGO = "秒前";  
    private static final String ONE_MINUTE_AGO = "分钟前";  
    private static final String ONE_HOUR_AGO = "小时前";  
    private static final String ONE_DAY_AGO = "天前";  
    private static final String ONE_MONTH_AGO = "月前";  
    private static final String ONE_YEAR_AGO = "年前";

    private static final String ONE_HOUR_LATE = "小时到期";
    private static final String ONE_DAY_LATE = "天到期";
    private static final String ONE_MONTH_LATE = "月到期";

    public static void main(String[] args) throws Exception {  
        //SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        //Date date = format.parse("2018-04-09 13:3:05");  
        System.out.println(format("2018-08-16 15:37:00"));
        //System.out.println(formatLate("2018-06-27 18:03:05"));
    }

    public static String format(String datetemp) throws Exception {
        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        Date date = format.parse(datetemp);
        long delta = new Date().getTime() - date.getTime();
        if (delta < 1L * ONE_MINUTE) {
            long seconds = toSeconds(delta);
            return (seconds <= 0 ? 1 : seconds) + ONE_SECOND_AGO;
        }
        if (delta < 60L * ONE_MINUTE) {
            long minutes = toMinutes(delta);
            return (minutes <= 0 ? 1 : minutes) + ONE_MINUTE_AGO;
        }
        if (delta < 24L * ONE_HOUR) {
            long hours = toHours(delta);
            return (hours <= 0 ? 1 : hours) + ONE_HOUR_AGO;
        }
        if (delta < 48L * ONE_HOUR) {
            return "昨天";
        }
        if (delta < 30L * ONE_DAY) {
            long days = toDays(delta);
            return (days <= 0 ? 1 : days) + ONE_DAY_AGO;
        }
        if (delta < 12L * 4L * ONE_WEEK) {
            long months = toMonths(delta);
            return (months <= 0 ? 1 : months) + ONE_MONTH_AGO;
        } else {
            long years = toYears(delta);
            return (years <= 0 ? 1 : years) + ONE_YEAR_AGO;
        }
    }
  
    public static String formatLate(String datetemp) throws Exception {
    	SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");  
    	Date date = format.parse(datetemp); 
        long delta = date.getTime() - new Date().getTime();
        if (delta < 24L * ONE_HOUR) {
            long hours = toHours(delta);  
            return (hours <= 0 ? 1 : hours) + ONE_HOUR_LATE;
        }  
        if (delta < 30L * ONE_DAY) {
            long days = toDays(delta);  
            return (days <= 0 ? 1 : days) + ONE_DAY_LATE;
        }  
        else {
            long months = toMonths(delta);
            return (months <= 0 ? 1 : months) + ONE_MONTH_LATE;
        }
    }



  
    private static long toSeconds(long date) {  
        return date / 1000L;  
    }  
  
    private static long toMinutes(long date) {  
        return toSeconds(date) / 60L;  
    }  
  
    private static long toHours(long date) {  
        return toMinutes(date) / 60L;  
    }  
  
    private static long toDays(long date) {  
        return toHours(date) / 24L;  
    }  
  
    private static long toMonths(long date) {  
        return toDays(date) / 30L;  
    }  
  
    private static long toYears(long date) {  
        return toMonths(date) / 365L;  
    }  

}
